Stageless change-speed gearing



July 10, 1928.

E. STCKEMANN STAGELESS CHANGE SPEED GEARING I Filed Feb. 1, 1927 /n ventor:

J tirely eliminated.

Patented July 10, 1928.

UNITED STATES nnus'r srocxnmmu, or BEnLm-rEmrELnor; GERMANY.

STAGELESS CHANGE-SPEED GEARING.

Application filed February 1, 1927, Serial No. 165,169, and inGermany February 7, 1926.

i All stageless change-speed-gears hitherto known, by which control is effected by fricthe output, resulting from the product of load and length of way, is reduced on the driven shaft under reduction of the number of revolutions.

In the change-speed-gearin'g according to the present invention, this drawback is en- The output remains perfectly equal with the same between any selected minimum number of revolutions and any selected maximum number of revolutions- This is achieved in such a manner,

that between a change-speed-gearing of any one known construction, practically adapted to be regulated down to about naught and' .are partly driven by the first planet-gearmovement and partly by the driving shaft.

- Under corresponding adjustment of the change-speed-gearingit is possible to prevent rotation of the planet-gear-carrier, so

that the planet-gears, act as ordinary transmlssion-gears and a great turning moment is produced. s The object of the invention is illustrated by an example in the accompanying drawing, in which Fig. 1 is a vertical, longitudinal section, Fig. 2 an end-view in reduced scale.

The gearing consists of a casing 1, in

which the driving shaft 2 'is disposed. Outside of the casing, the shaft 2 carries a beltpulley 2', inside of the casing 1, a belt-pulley 3 is mounted upon the shaft 2, the diameter of which is variable in known manner.

This belt-pulley is advantageously made in accordance with the American Patent-specification 1,581,697.

A second shaft 4 is provided in the casing 1, upon which a belt-pulley 5 is mounted, the diameter of which is likewise variable,

Both belt-pulle s are simultaneously adjusted thus, that t e diameter of the one pulley is reduced, while the diameter of the other one is increased.

The adjustmentvdevices of the two pulleys 3and 5 are coupled by means of the shaft 6'.

The shaft/i is supported in the casing 1 by means of eccentric pivots 6 and 7. It can be adjusted by means of the worm-wheel 8.

.and the worm 9, in order to regulate the tension of the belt 10. To enable adjustment of the shaft 4, the rod -6 is provided with Cardan-joint 11.

Another belt-pulley 12 is rigidly connected with the belt-pulley 5.

A driving-belt 29 runs from the belt-pul ley 12 to a belt-pulley 30, designed as carrier for the planet-wheels 31. These planet wheels 31 mesh on the one hand with a mangle-wheel 32, firmly connected upon the driving shaft 2 by means of a key 33 and on the other hand in a central wheel 34 fixed upon a hollow shaft 35, by means of a key 36. The belt-pulley 30 is mounted upon a shaft 37, this shaft 37 is dispozed in the direction of the axis of the driving shaft 2, but the shaft 37 is rotatable against the shaft 2. this shaft 37. The hollow shaft 35 is rigidly connected with a drum 38. A planet-gearmangle-wheel 39 of this gearing is arranged upon the shaft 37, it isdesigned as bevelus I The hollow shaft 35 is slipped over gear and acts upon a bevel-gear 40 likewise supported inside'the drum 38.

bevel-gear 40 is firmly connected with a bevel-gear 41 of like diameter as the bevelgear 40. The bevel-gear 41 drives a bevelgear 42 firmly connected with a spur-gear 43. The mean pitch-circle-diameter of the bevel-gear 42 is equal to the pitch-circle diameter of the gear 43. The toothed wheel 43 meshes with a gear 44, rigidly connected with the driven shaft 45.

The mode of action of this gearing is as The axle of I the bevel-gear 40 is disposed radially. The

3 and 5, the belt-pulley 30 with its planet wheels 31 may be made to rotate at any de-- sired numberof revolutions. If the number of revolutions of the belt-pulley 30 1s equal to the. number of revolutions of the drivingshaft 2, the driven shaft 45 is driven direct. All toothed wheels serve in this case simply as coupling, but do not revolve over one another.

If the number of revolutions of the beltulley is getting greater than the numer of revolutions of the driving shaft 2, the direct drive is partly cut out and indirect driving is effected. The wheel 34 and the hollow shaft 35 have now a greater number of revolutions than the shaft 37 so that the mangle wheel 39, the bevel gear 40 and the bevel gears 41 and 42 drive the spur gear 43 and the gear 44 in a direction which diminishes the number of revolutions of th driven shaft '45.

By further increasing the number of revolutions of the belt-pulley 30, the spur gear 43 can be rotated with such a velocity that the numberof revolutions of the driven shaft 45 is equal to'naught.

Under all numbers of revolutions ranging above the minimum number of revolutions by indirect driving up to the maximum number of revolutions by direct driving, the power of the driven shaft will always reman the same, as the forces of indirect driving, aswell as the forces of direct driving act in the same direction upon the shaft 45. The reaction of the tooth-pressure of the planet-wheels 43, which must to be taken up y the belt, is greatly diminished in consequence of the arrangement of the double bevel-gear 40, 41, or compensated. I claim: v 1. In a stageless change-speed-gearing a driving-shaft, a counter shaft parallel to said driving shaft, a stageless belt-pulley changespeed-gear between said shafts, an intermediate shaft coaxial to said driving shaft, a hollow shaft surrounding said intermediate shaft, a planet gear movement, the intermeshing wheels of said planet gear movement being arranged upon said driving shaft, upon said intermediate shaft and upon said hollow shaft, a belt drive between said countershaft and said intermediate shaft, through the agency of which the wheels upon the intermediate shaft are caused ,to travel around the axis of said shaft at a rate of speed corresponding to or varying from that at which the drive shaft is rotated, a driven shaft, a second planet-gear movement, the wheels of said second planet gear movement being arranged upon said intermediate shaft, upon said hollow shaft and upon said driven shaft.

2. In a stageless change-speed-gearinga driving shaft, a counter shaft parallel to .said driving shaft, an intermediate shaft coaxial to said driving shaft, a hollow shaft surrounding said intermediate shaft, a beltpulley of variable diameter on said driving shaft, a corresponding belt-pulley and a third belt-pulley o1 invariable diameter fixed upon said counter shaft, a fourth belt-pulley disposed upon said intermediate shaft, a belt connecting the first and second mentioned pulleys, a second belt connecting the third and fourth pulleys, a planet gear movement, the planet wheels being carried by Lavage? posed upon said driving shaft in mesh with said planet wheels, and the second mangle wheel being disposed upon said hollow shaft in mesh with said plant wheels, a driven shaft, a second planet-gear movement, the

intermeshing wheels of said second planet car movement being arranged upon said intermediate shaft, upon said hollow shaft and upon said driven shaft.

.3. In a stageless change-speed-gearing a driving shaft, a counter shaft parallel to said driving shaft, an intermediate shaft coaxial to said driving shaft, a hollow shaft surrounding said intermediate shaft, a belt-pulley of variable diameter on said driving shaft, a corresponding belt-pulley and a thirdbeltpulley of invariable diameter fixed upon said counter shaft, a fourth belt-pulley disposed upon said intermediate shaft, a belt pulley connecting the first and second mentioned pulleys, a second belt connecting the third and fourth pulleys, a planet gear movement,

the planet Wheels being carried by the beltpulley upon said intermediate shaft and adapted to be revolved around the axis of said shaft at a rate of speed corresponding to or varying from the speed of the driving shaft, dependent upon adjustment of the diameters of the first and second mentioned pulleys, the first mangle-wheel of said gear being disposed upon said driving shaft in mesh with said planet wheels and the second mangle wheel, in mesh with said planet wheels being disposed upon the hollow shaft surrounding said intermediate shaft, a driven shaft and a second planet gear movement including a mangle wheel disposed upon said intermediate shaft, a planet wheel meshing with said mangle wheel and mounted in a carrier connected to the hollow shaft surrounding said intermediate shaft and a second mangle wheel driven by the planet wheel and disposed upon the driven shaft.

4.- In a stageless change-speed-gearing a driving shaft, a counter shaft parallel to said driving shaft, an intermediate shaft coaxial to said driving shaft,'a hollow shaft surrounding said intermediate shaft, a belt-pulley of variable diameter on said driving shaft, a second belt ulley of variable diameter fixed upon said counter shaft, a belt connectin saidpulleys a third belt-pulley of invaria le diameter fixed upon said counter shaft, a fourth belt-pulley disposed upon said intermediate shaft, a second belt connecting the third and fourth belt-pulleys, a"

planet gear movement, the planet wheels being carried by the belt-pulley upon said inter-mediate shaft and revolvable about the axis of said shaft at various speeds de endent upon adjustment .of the variable iameter pulleys carried by the'driving and counter shafts, the first mangle-wheel of said gear being disposed uponsaid driving shaft and the second mangle wheel being disposed upon' the hollow shaft surrounding said intermediate shaft, a driven shaft a second planet gear movement, the first'mangle wheel of said second gear being disposed upon said intermediate shaft and being desi ed as a bevel-gear, a second'bevel-gear mes ing into said mangle wheel, the axis of said second bevel-gear being directed radially, a third bevel-gear firmly connected to said second bevel-gear, a fourth bevel gear meshing with said third bevel-gear, a planet wheel rigidly connected to said fourth bevel gear, said second,- third and fourth bevel gears and said 4 planet wheel being carried by and revolvable with the hollow shaft, a driven shaft and a second mangle-wheel fixed to the driven shaft and meshing with said planet wheel.

5. In a stageless change speed mechanism, the combination of a plurality of rotatably mounted shafts including coaxial drive, intermediate and driven shafts and ahollow shaft surrounding said intermediate shaft, a planetary gear including gear elements fixed diate and driven shafts. I

In testimony whereof I have aflixed my signature.

ER -s'r s'rooK MANN.

re actively to said drive shaft and to said hol ow shaft to travel therewith, intermeconnecting the gear elements of the interme- 

